Lifting-jack.



LIFTING JACK.

APPLICATION FILED APn.2.1915.

Patente Feb; y8, 1916.v

w/mfssfs 'ma coLUMB'xA PLAtgoaRAPi-x co., WASHINGTON, D.

eurens, raie.

extending laterally v ce of pipe' 5'4 which ions 6, Vwhereby a'A :ket isprovided. the wrenchr corn- 'le shaft' or. rod 7 idable in the pbase"the rod is a load'-` lg of a tube 8 and re load is supportrthe upperend' of ded with" a T-cou- V tterally extending is adapted to 'beoperated, and the ilt'aneously ybut at han the rod 7. In section ofy thejack rentially .movable nbodie's a lever 12 )per end of a link :h ispivotedI 'on a tends through` the 111 being' disposed i. The lever 12 iswith the rodv 7, so edi, the rod 7 will lever 12 extends s extremity 17is vith the *lower end sov -ias its upper end wardly projecting nrtofthe movable e pivot 18`is more 13 thanA the pivot lave a more rapid 7and obviously nge of movement.

le b`arn22 for in- The load is' held p i 23 which is oon- LrrTING-JACK.

spedica'uqnof Letters imitant'. i

Patent Appliaaron` inedl Aprii a, 19151 serial' No. 18,715.

To all ywhom it may concern.' l i' Be it known that I, GEORGE A. PIPER,a citizen ofthe United States,and a resident of Omaha, in the county ofDouglas and vState of Nebraska, have invented a new and ImprovedLifting-J ack, of which the followinvV is a -full clear' and exactdescri tion".4

f This invention relates to lifting jacks of that type including" alever for actuating the movable part or loadeelevatfing element of theack.

The invention hasv foi-its general objects to improve and simplify the'construction and operation of devices of the character referred to so asto be reliable and efhcient in use, comparatively simple' and inexpenrsive'to manufacture, and' so designed as tobe quick in action. l

A more specific object of the invention is the provision of aquick-acting jack in which the *movable part thereof is made in twoelements operating simultaneously by a sin; gle lever but having adifferent range of movement, whereby the total lifting action of thejack is materiallyv increasedy compared with the normal height thereof,and where# by the power is materially increased.

Another specific object of the invention is the4 provision of a propbetween the movable l section of the jack andthe base or stationarysection, which prop is automatically set as the operating lever isactuated in the lifting' of a load, there being means for releasing theprop when the load is to be lowered.

Vith such objects in view, and others which. will appear as thedescription pro.- ceeds, the invention comprises various novel featuresof construction and arrangement of parts which will be set forth withparticularity in the following description f and claims appended hereto.

In the accompanying drawing, which,

illustrates one embodiment of the invention and wherein similarcharacters of reference.

indicate corresponding parts in all thev views, Figure 1 is a side viewof the jack with portions in section; Fig. 2`is a horizontal section onthe line 2 2, Fig. 1; and Fig. 3 is a detail sectional viewv on the line3 3, Fig. 1.

Referring to the drawing, A designates the base or body section of thejack, which in the present instance is shown as a secvtion of pipe 1threaded into a foot-piece 2 and having on its upper end a T-coupling 3with lone arm 4 thereof ve and containing a shorty pie is split to* formbifurcati laterally v extending. brac The movable section B oi prises avertically mov'a'b that has its lower end sli column 1, and sli'da'ble'on carryingf'j elementl consistir a seat' 9,; on which latter'tl ed.The' tube 8' surrounds thesha-ft '7 and it is provi pling 10 thatcarries a lz member The rod'7 raisedA when the' jack is' 1 part' 8 isalsoV raised simi a different rate or faster tl other words, the movables isy composed of two di'e parts7 and 8.

The operating means er fulcrumed at 13 on' the u1 14', the Vlower end ofwhic horizontal bolt 15 that eX bracket piece 5, the linkV between thebifurcations t pivotally connected `at 16 that asl the lever 12 is tiltmove up' or down; The

beyond the rod 7 and it; pivotallyconnecte'd at 18 v of a link19,-w'hich link] 2O pivoted at 21 to the for bracket 11 of 'the upperpasection of the jack. As thi remote' from the fulcrum' 16, the upperpartV 8 will l movement than the part the part Sh'a's agreater ra Thelever 12has a hand creasing the leverage; 'l raised by'means of a v propnected with thepivot 18,

tends downwardly across 1 jack'and coperates with which latter isadapted to of a series of ratchet teeth edge of the prop 23. Th .are soshaped that, as the to raise a load, the prop wardly on the pivot pinwill automatically lock thi load has been raised to'th To lower the loadit is ne the prop, yand for this pu means is mounted on the operatinglever,

such means comprising a bell-crank lever 25 that is connected by a link26 with the lower end of the prop 23, and connected by a rod 27 with agrip lever 28 associated with the handle end of the handle bar 22. Thus,by pressing the grip lever 28 the prop is raised so that its teeth willfree the pin l5, and while it is thus held released the operating lever22 is allowed to move upwardly so that the. load on the' Iiack will belowered.

From the foregoing description taken in connection with theaccompanying' drawing, the advantages of the construction and method ofoperation will be readily understood by those skilled in the art towhich the invention appertains, yand while I have def scribed theprincipleof operation, together with the device which I now consider tobe the best embodiment thereof, desire to have it understood that thedevice shown is merely illustrative and that such changes may be madewhen desired as fall within the scope of the appended claims.

Having thus described my invention, I claim as new and desire to secureby Letters Patent: v

l. A jack comprising a stationary base section, a movable upper sectioncomposed of two parts movable simultaneously in the same direction andat different rates, and an'operating lever ulcrumed on the base sectionand operatively connected with the said movable parts on the uppersection.

2. A, jack comprising a stationary base section, a movable upper sectioncomposed of two parts movable simultaneously in the same direction andat different rates, an operating lever fulcrumed on the base section andoperatively connected with the said movable parts on the upper section,and a prop pivotally connected with the lever and having meansautomatically engaging the base section to prop the lever raised.

3. A jack comprising a stationary base section, a movable-uppersectioncomposed of differentially movable parts, an Yoperating leverfulcrumed on the base usection and operatively connected with the saidmovable parts on the upper section, a prop pivotally connected with thelever and having means automatically engaging the base section toelement slidable on the upper end oi the rod, an operating lever, meansfor ulcruni- Iing the lever on the column, a pivotal. connection betweenthe lever and rod, and means for operatively connecting the loadcarryingelement with the lever at a point more remote from the fulcrum of thelever than .the pivotal connection between Ythe lever and the rod. Y

'5. A jack comprising a base section embodying a .hollow column, a rodslidable vertically on the column, a load-carrying element Yslidable onthe upper end of the rod, an operating lever, means ior ulcruming thelever on the column, a pivotal connection between the lever and rod,means for operatively connecting the load-carrying element with thelever at a point more remote from the fulcrum of the lever than thepivotal connection between .the lever and the rod, and an yautomaticprop device for holding the rod and load-carrying element propped upwhen sustaining a load.

6. A jack comprising a base section including a hollow column, a rodmovable vertically in the column, a load-carrying element slidable onthe upper end of the rod, a link pivoted on the column, a leverfulcrnmed on the link, a pivotal connection between the lever and rod, alink pivotally connected with the load-carrying element, a pivotalconnection between the lever and last mentioned link, a prop pivotallyconnected with the lever and having ratchet teeth, and mea-ns carried bythe column with which the teeth are adapted to engage to prop the rodand load-carrying element raised, and means carried by the lever forreleasingthe prop for permitting the rod and load-carrying element to belov/ered.

ln testimony whereof I have signed my name to this specilication in thepresence oi two subscribing witnesses.

GEORGE ARTI-IER PPER.

i J. W. TIBrr'rs,

E. SREIGER.

Copies of this patent may be obtained yfor five cents each, byaddressing;1 the Commissioner of Patents.

Washington, D. C.

